#include "../include/http_util.h"
#include "../include/logger.h"
#include <cstdio>
#include <cctype>

namespace http {

// HTTP状态码映射表
static std::unordered_map<int, std::string> _statuMsg = {
    {100, "Continue"},
    {101, "Switching Protocol"},
    {102, "Processing"},
    {103, "Early Hints"},
    {200, "OK"},
    {201, "Created"},
    {202, "Accepted"},
    {203, "Non-Authoritative Information"},
    {204, "No Content"},
    {205, "Reset Content"},
    {206, "Partial Content"},
    {207, "Multi-Status"},
    {208, "Already Reported"},
    {226, "IM Used"},
    {300, "Multiple Choice"},
    {301, "Moved Permanently"},
    {302, "Found"},
    {303, "See Other"},
    {304, "Not Modified"},
    {305, "Use Proxy"},
    {306, "unused"},
    {307, "Temporary Redirect"},
    {308, "Permanent Redirect"},
    {400, "Bad Request"},
    {401, "Unauthorized"},
    {402, "Payment Required"},
    {403, "Forbidden"},
    {404, "Not Found"},
    {405, "Method Not Allowed"},
    {406, "Not Acceptable"},
    {407, "Proxy Authentication Required"},
    {408, "Request Timeout"},
    {409, "Conflict"},
    {410, "Gone"},
    {411, "Length Required"},
    {412, "Precondition Failed"},
    {413, "Payload Too Large"},
    {414, "URI Too Long"},
    {415, "Unsupported Media Type"},
    {416, "Range Not Satisfiable"},
    {417, "Expectation Failed"},
    {418, "I'm a teapot"},
    {421, "Misdirected Request"},
    {422, "Unprocessable Entity"},
    {423, "Locked"},
    {424, "Failed Dependency"},
    {425, "Too Early"},
    {426, "Upgrade Required"},
    {428, "Precondition Required"},
    {429, "Too Many Requests"},
    {431, "Request Header Fields Too Large"},
    {451, "Unavailable For Legal Reasons"},
    {501, "Not Implemented"},
    {502, "Bad Gateway"},
    {503, "Service Unavailable"},
    {504, "Gateway Timeout"},
    {505, "HTTP Version Not Supported"},
    {506, "Variant Also Negotiates"},
    {507, "Insufficient Storage"},
    {508, "Loop Detected"},
    {510, "Not Extended"},
    {511, "Network Authentication Required"}
};

// MIME类型映射表
static std::unordered_map<std::string, std::string> _mimeMsg = {
    {".aac", "audio/aac"},
    {".abw", "application/x-abiword"},
    {".arc", "application/x-freearc"},
    {".avi", "video/x-msvideo"},
    {".azw", "application/vnd.amazon.ebook"},
    {".bin", "application/octet-stream"},
    {".bmp", "image/bmp"},
    {".bz", "application/x-bzip"},
    {".bz2", "application/x-bzip2"},
    {".csh", "application/x-csh"},
    {".css", "text/css"},
    {".csv", "text/csv"},
    {".doc", "application/msword"},
    {".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
    {".eot", "application/vnd.ms-fontobject"},
    {".epub", "application/epub+zip"},
    {".gif", "image/gif"},
    {".htm", "text/html"},
    {".html", "text/html"},
    {".ico", "image/vnd.microsoft.icon"},
    {".ics", "text/calendar"},
    {".jar", "application/java-archive"},
    {".jpeg", "image/jpeg"},
    {".jpg", "image/jpeg"},
    {".js", "text/javascript"},
    {".json", "application/json"},
    {".jsonld", "application/ld+json"},
    {".mid", "audio/midi"},
    {".midi", "audio/x-midi"},
    {".mjs", "text/javascript"},
    {".mp3", "audio/mpeg"},
    {".mpeg", "video/mpeg"},
    {".mpkg", "application/vnd.apple.installer+xml"},
    {".odp", "application/vnd.oasis.opendocument.presentation"},
    {".ods", "application/vnd.oasis.opendocument.spreadsheet"},
    {".odt", "application/vnd.oasis.opendocument.text"},
    {".oga", "audio/ogg"},
    {".ogv", "video/ogg"},
    {".ogx", "application/ogg"},
    {".otf", "font/otf"},
    {".png", "image/png"},
    {".pdf", "application/pdf"},
    {".ppt", "application/vnd.ms-powerpoint"},
    {".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
    {".rar", "application/x-rar-compressed"},
    {".rtf", "application/rtf"},
    {".sh", "application/x-sh"},
    {".svg", "image/svg+xml"},
    {".swf", "application/x-shockwave-flash"},
    {".tar", "application/x-tar"},
    {".tif", "image/tiff"},
    {".tiff", "image/tiff"},
    {".ttf", "font/ttf"},
    {".txt", "text/plain"},
    {".vsd", "application/vnd.visio"},
    {".wav", "audio/wav"},
    {".weba", "audio/webm"},
    {".webm", "video/webm"},
    {".webp", "image/webp"},
    {".woff", "font/woff"},
    {".woff2", "font/woff2"},
    {".xhtml", "application/xhtml+xml"},
    {".xls", "application/vnd.ms-excel"},
    {".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
    {".xml", "application/xml"},
    {".xul", "application/vnd.mozilla.xul+xml"},
    {".zip", "application/zip"},
    {".3gp", "video/3gpp"},
    {".3g2", "video/3gpp2"},
    {".7z", "application/x-7z-compressed"}
};

size_t HttpUtil::split(const std::string &src, const std::string &sep, std::vector<std::string> *arry) 
{
    size_t offset = 0;
    // 有10个字符，offset是查找的起始位置，范围应该是0~9，offset==10就代表已经越界了
    while (offset < src.size())
    {
        size_t pos = src.find(sep, offset); // 在src字符串偏移量offset处，开始向后查找sep字符/字串，返回查找到的位置
        if (pos == std::string::npos)
        {
            // 没有找到特定的字符
            // 将剩余的部分当作一个字串，放入arry中
            if (pos == src.size())
                break;
            arry->push_back(src.substr(offset));
            return arry->size();
        }
        if (pos == offset)
        {
            offset = pos + sep.size();
            continue; // 当前字串是一个空的，没有内容
        }
        arry->push_back(src.substr(offset, pos - offset));
        offset = pos + sep.size();
    }
    return arry->size();
}

bool HttpUtil::readFile(const std::string &filename, std::string *buf) 
{
    std::ifstream ifs(filename, std::ios::binary);
    if (ifs.is_open() == false)
    {
        printf("Open %s file failed!!", filename.c_str());
        return false;
    }
    size_t fsize = 0;
    ifs.seekg(0, ifs.end); // 跳转读写位置到末尾
    fsize = ifs.tellg();   // 获取当前读写位置相对于起始位置的偏移量，从末尾偏移刚好就是文件大小
    ifs.seekg(0, ifs.beg); // 跳转到起始位置
    buf->resize(fsize);    // 开辟文件大小的空间
    ifs.read(&(*buf)[0], fsize);
    if (ifs.good() == false)
    {
        printf("Read %s file failed!!", filename.c_str());
        ifs.close();
        return false;
    }
    ifs.close();
    return true;
}

bool HttpUtil::writeFile(const std::string &filename, const std::string &buf) 
{
    // trunc：文件的内容清空，然后新的数据从文件的开头写入
    std::ofstream ofs(filename, std::ios::binary | std::ios::trunc);
    if (ofs.is_open() == false)
    {
        printf("open %s file failed!!", filename.c_str());
        return false;
    }
    ofs.write(buf.c_str(), buf.size());
    if (ofs.good() == false)
    {
        LOG_FATAL("Write %s file failed!", filename.c_str());
        ofs.close();
        return false;
    }
    ofs.close();
    return true;
}

// 将特殊字符的ascii值，转换为两个16进制字符，前缀%
std::string HttpUtil::urlEncode(const std::string url, bool convert_space_to_plus) 
{
    std::string res;
    for (auto &c : url)
    {
        if (c == '.' || c == '-' || c == '_' || c == '~' || isalnum(c))
        {
            res += c;
            continue;
        }
        if (c == ' ' && convert_space_to_plus == true)
        {
            res += '+';
            continue;
        }
        // 剩下的字符都是需要编码成为 %HH 格式
        char tmp[4] = {0};
        // snprintf 与 printf比较类似，都是格式化字符串，只不过一个是打印，一个是放到一块空间中
        snprintf(tmp, 4, "%%%02X", c); // %HH形式 %%:实际的%  %02X:%格式化占位符的开始 02 输出宽度为2，不足的0填充 X十六进制
        res += tmp;
    }
    return res;
}


char HttpUtil::hexToI(char c) 
{
    if (c >= '0' && c <= '9')
    {
        return c - '0';
    }
    else if (c >= 'a' && c <= 'z')
    {
        return c - 'a' + 10;
    }
    else if (c >= 'A' && c <= 'Z')
    {
        return c - 'A' + 10;
    }
    return -1;
}

std::string HttpUtil::urlDecode(const std::string url, bool convert_plus_to_space) 
{
    // 遇到了%，则将紧随其后的2个字符，转换为数字，
    // 第一个数字左移4位，然后加上第二个数字  + -> 2b  %2b->2 << 4 + 11
    std::string res;
    for (int i = 0; i < url.size(); ++i)
    {
        if (url[i] == '+' && convert_plus_to_space == true)
        {
            res += ' ';
            continue;
        }
        if (url[i] == '%' && (i + 2) < url.size())
        {
            char v1 = hexToI(url[i + 1]);
            char v2 = hexToI(url[i + 2]);
            char v = v1 * 16 + v2;
            res += v;
            i += 2;
            continue;
        }
        res += url[i];
    }
    return res;
}

std::string HttpUtil::statuDesc(int statu) 
{
    auto it = _statuMsg.find(statu);
    if (it != _statuMsg.end())
    {
        return it->second;
    }
    return "Unknow";
}

std::string HttpUtil::extMime(const std::string &filename) 
{
    // a.b.txt  先获取文件扩展名
    size_t pos = filename.find_last_of('.');
    if (pos == std::string::npos)
    {
        return "application/octet-stream";
    }
    // 根据扩展名，获取mime
    std::string ext = filename.substr(pos);
    auto it = _mimeMsg.find(ext);
    if (it == _mimeMsg.end())
    {
        return "application/octet-stream";
    }
    return it->second;
}

bool HttpUtil::isDirectory(const std::string &filename) 
{
    struct stat st;
    int ret = stat(filename.c_str(), &st);
    if (ret < 0)
    {
        return false;
    }
    return S_ISDIR(st.st_mode); // 利用宏判断是否是目录
}

bool HttpUtil::isRegular(const std::string &filename) 
{
    struct stat st;
    int ret = stat(filename.c_str(), &st);
    if (ret < 0)
    {
        return false;
    }
    return S_ISREG(st.st_mode); // 利用宏判断是否是普通文件
}

bool HttpUtil::validPath(const std::string &path) 
{
    // 思想：按照/进行路径分割，根据有多少子目录，计算目录深度，有多少层，深度不能小于0
    std::vector<std::string> subdir;
    split(path, "/", &subdir);
    int level = 0;
    for (auto &dir : subdir)
    {
        if (dir == "..")
        {
            level--; // 任意一层走出相对根目录，就认为有问题
            if (level < 0)
                return false;
            continue;
        }
        level++;
    }
    return true;
}

} // namespace http